<?php

/**
 * UserIdentity represents the data needed to identity a user.
 * It contains the authentication method that checks if the provided
 * data can identity the user.
 */
class UserIdentity extends CUserIdentity
{
	/**
	 * Authenticates a user.
	 * The example implementation makes sure if the username and password
	 * are both 'demo'.
	 * In practical applications, this should be changed to authenticate
	 * against some persistent user identity storage (e.g. database).
	 * @return boolean whether authentication succeeds.
	 */
	public function authenticate()
	{
		/* $users=array(
			// username => password
			'demo'=>'demo',
			'admin'=>'admin',
		); */
		
		$criteria = new CDbCriteria();
		$criteria->select='*';  // only select the 'title' column
		$criteria->condition='username=:username';
		$criteria->params = array(":username"=>$this->username);
		
		$user = User::model()->find($criteria);
		
		if(!isset($user)){
			$this->errorCode=self::ERROR_USERNAME_INVALID;
		}else{
			if($user->password !== $this->password)
				$this->errorCode=self::ERROR_PASSWORD_INVALID;
			else
				$this->errorCode=self::ERROR_NONE;
		}
		return !$this->errorCode;
			
	}
}